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Un/ike other countries, pin-type porcelain insulators are considered traditional in Brazil and are applied on a large scale in electric power distribulion /ines in a predominantly aerial type conjiguralion. Despi/e their low cosi compared to other components of the electric power distribution network, these insulators have undergone serious unprogrammed shutdowns resulting from problems such as defects in the dielectric material; mechanical breakdown of the upper portion of the insulators caused by dilation strains in lhe set (thread and pin); and destruclion by acts of vanda/ism. Jt is therefore considered opportune to engage in studies focusing on a/ternalive insulators. This mas ter 's disserfafion reports on a study o f pin-type polymeric insulators manufactured with castor oil-based polyurethane resins, comparing them with porcelain insu/ators. This rese(/rch work discusses the mamifacturing process of pin type polymeric insu/ators; computerized tomography-based analyses of these insulators carried ou/ to ver(fY the lwmogeneify of the die/ectric material 's composition; the results of a/ternating electric current tests and mechanica/ flexure tests before and after acce/erated aging conducted.for 5,000 hours in a Weather Ometer device. 1'he results of the ac current tests demonstrated that aged and unaged e/ectric insulators display lhe same electrica/ behavior under a/ternaling e/ectric current, while lhe mechanical.flexure tests revealed that aged insulators possess greater mechanical rigidity. ix

Estudo sobre isoladores poliméricos à base de resinas poliuretanas para ambiente externo